Halibut reads documentation source in a single input format, and
produces multiple output formats containing the same text. The
supported output formats are:

* Plain ASCII text
* HTML
* PDF
* PostScript
* Unix man pages
* Unix info, generated directly as .info files rather than .texi
  sources
* Windows HTML Help (.CHM files), or rather source which can be fed to
  the MS HTML Help compiler to generate them
* Windows WinHelp (old-style .HLP files), generated directly without
  needing a help compiler.
